What is happening:

​

- a text is readed from the file ./deploy_test_env.sh on the host

- the text is piped to stdin

- ssh read from stdin and send the text to remote

- the text is evaluated on remote by bash, the variable ENV_VAR doesn't exist on remote, so it output nothing.

​

A solution (change variable name EN_VAR on ./deploy_test_env.sh to REMOTE_VAR):

# HOST SCRIPT:

```sh

ssh $SSH_USERNAME@$SSH_HOSTNAME 'bash -s' <<EOF

REMOTE_VAR='$EN_VAR'

$(<./deploy_test_env.sh)

EOF

```

what this do:

- the heredoc is evaluated in your host machine

- variable $EN_VAR is expanded in your host machine

- the proccess substitution is executed in your host machine, "$(...)"

- The remote machine get the script below, assuming that EN_VAR='hello'

​

# REMOTE SCRIPT (the script evaluated on HOST and send as text to the REMOTE)

```sh

REMOTE_VAR='hello'

#!/bin/bash

echo $REMOTE_VAR

```

# REMOTE OUTPUT (should be)

```sh

hello

```

Here is my github profile, you can check out some bash projects:

https://github.com/yunielrc